A subclass ofFromDigits that also allows to convert number literals containing a decimal point ".".
Convertdigits string to value of typeTdigits can contain
Convertdigits string to value of typeTdigits can contain
+ or-if digit string is not legal for the given type
if value of result does not fit intoT's range
in case of numeric underflow (e.g. a non-zero floating point literal that produces a zero value)